CN102539072B - Field dynamic balance measuring device and method for utility boiler side fan - Google Patents
Field dynamic balance measuring device and method for utility boiler side fan Download PDFInfo
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Abstract
The invention discloses a field dynamic balance measuring device and a method for a utility boiler side fan. The method comprises the following steps of: I, reading a vibration value by using an axis vibration probe and a key phase value, wherein the vibration value comprises a power frequency amplitude and a phase angle; II, determining a weighting testing position: directly calculating a position required to be weighted by using a read-out phase angle phi, and calculating a weighting position angle theta=phi-phi1-phi2+180 degrees (1), wherein a position on a key phase groove where a disk rotor is reversely rotated by the angle theta serves as the position required to be weighted; and III, determining a weighting testing magnitude: calculating P=A0*Gg/r omga<2> S (2), inquiring needed parameters in a formula (2) from fan specifications to calculate the weighing testing magnitude. Due to the adoption of the device and the method, the successful rate of one-time weighing is greatly increased, a calculating formula is simplified, and complex steps for attaching cursors by halting are reduced on the aspect of process.
Description
Technical field
The present invention relates to a kind of boiler of power plant crosswind machine spot dynamic balance measurement mechanism and dynamic balance method.
Background technology
In power plant, boiler side blower fan comprises primary air fan, Powder discharging fan, induced draft fan, pressure fan, desulfurization booster fan, seal fan, purification fan etc., they are one of equipment important in boiler accessory machinery, and the stable safety that is directly connected to whole steam generator system of fan operation is normally moved.
The mass unbalance of draught fan impeller refers to that the barycenter of impeller does not overlap with its rotation center, one of modal fault of boiler phase Blowing stopper in Ta Shi power plant.Cause that the unbalanced reason of Impeller Mass has: 1, birth defects: as inhomogeneous in material, structural design is unreasonable, manufacturing and fixing error, there is certain mass eccentricity in impeller in design, processing, manufacture; 2, the day after tomorrow in service causing: when as poor in working condition, blade is very easily worn, larger particles and small dust granules are with high temperature, flue gas at a high speed by induced draft fan, and blade can suffer continuously to wash away; Meanwhile, impeller surface is at high temperature easy to oxidation and generates thick oxide skin, Automatic-falling under centrifugal force or effect of vibration power.Under long-term double action, blade exit place forms blade-like wearing and tearing.The wearing and tearing of blade damaged part are random, and are irregular, have caused the imbalance of impeller.The fouling of impeller also can cause larger mass unbalance in addition, and the dust granules in flue gas can be adsorbed on blade non-working surface, forms more serious dust fouling especially in inflow point and the exit of non-working surface, and progressive additive.Wind-force, blast inhomogeneous, must make powder fouling inhomogeneous, causes the imbalance of impeller.
No matter be the mass unbalance above-mentioned which kind of situation causes, all can make the centrifugal force of epitrochanterian eccentric mass when vane rotary cause vibration.
Tradition dynamic balance processing method:
1. will fan rotor return to manufacturer's start Balance Treatment after dismounting, the method processing time is long, delays normal power generation production work, and after impeller balance processes, reinstalls and may also have the large situation of vibration that the factors such as die misalignment cause.
2. the method for hand computation, as two-point method, three point method, method of scoring, these method calculation procedures are complicated, calculated amount is large, manual picture, precision is not high, and it is too many that examination increases the weight of number of times, large to equipment damage, the method is the forced method adopting in the unallowed situation of a kind of measuring equipment condition, is progressively eliminated at present;
3. phase method is surveyed in flash of light, and flashlamp is controlled by rotor signal lamp electric switch, and when on rotor, elongate recesses is by equilibrium point, photoelectricity door is accepted light, causes flash of light.Under stable case, under irradiating, flashlamp can see that epitrochanterian white line is as " be parked in " a certain scale always, utilize this stroboscopic phenomenon to read vibration phase, the method needs on rotor, to draw in advance a white line and serves as a mark, also to make index dial simultaneously, step is complicated, and precision is not high, is progressively eliminated.
4. photoelectric sensor is surveyed phase method, and the method is the method that current most power plant fans spot dynamic balance adopts, and concrete steps are: 1. shut down, do test and prepare.On fan shaft, paste reflecting strips, set up testing tool probe; 2. start, first measuring vibrations value, comprises power frequency amplitude and phase angle, records numerical value; 3. shut down, in the angle of estimating, add test mass by rule of thumb; 4. start, records and adds test mass after vibration value, comprises power frequency amplitude and phasing degree, utilizes dynamic balance principle to calculate and should add counterweight size and the angle that adds counterweight; 5. shut down, add counterweight firm welding, start again, measures power frequency amplitude and the phase place of residual vibration, if vibration allowed band balance finish, otherwise repeat the later operation of the 4th step.Whole operating process is loaded down with trivial details, needs to shut down just can measure, and can not meet real-time online observation.
Summary of the invention
Object of the present invention, exactly for addressing the above problem, provides a kind of boiler of power plant crosswind machine spot dynamic balance measurement mechanism and dynamic balance method, and it is simple in structure, and one-step installation is used all the life, has simplified measuring process, has met real time on-line monitoring.
For achieving the above object, the present invention adopts following technical scheme:
A kind of boiler of power plant crosswind machine spot dynamic balance measurement mechanism, blower fan impeller shaft is connected with motor by bearing, described impeller shaft place is provided with a support, a key is installed in support level position pops one's head in mutually, on support, a trench structure is opened along circumference in pop one's head in the mutually position on side of key, is provided with two and measures axle that axles the shake probe that shakes in trench structure.
Described support is arranged on concrete pedestal, and two axles shake and visit vertical direction layout of first horizontal direction, or arrange in left and right 45° angle mode.
Described axle shakes probe for eddy current probe.
A dynamic balance method for boiler of power plant crosswind machine spot dynamic balance measurement mechanism, its step is:
Step 1, utilize axle shake probe pop one's head in mutually and read vibration values with key, comprise power frequency amplitude and phase angle;
Step 2, examination increase the weight of determining of position: utilize the phase angle of reading
directly calculate and should increase the weight of position,
In formula,
for power frequency vibration phase value,
for vibration shape drag angle, draught fan impeller is rigid rotator, now
data transmission drag angle for axle shakes and pops one's head in, has mark on different sensor nameplates;
By formula (1), calculate and increase the weight of after position angle θ, at key phase groove place, against the moving rotor θ of steering wheel place, should increase the weight of position;
Step 3, examination increase the weight of determining of size: by lower formula, calculated
In formula, the examination on P-impeller adds weight, kg;
A
0-axle the original amplitude that probe measurement obtains of shaking, μ m;
R-increases the weight of radius, m;
The angular velocity of ω-rotor, rad/s;
G-rotor weight, kg;
G-acceleration of gravity, m/s2;
S-sensitivity coefficient, gets 100 when bearing rigidity is normal, get 200 when bearing rigidity is on the low side;
Desired parameters is all according to finding in blower fan instructions in formula (2), thereby calculates the size that examination adds weight.
As blower fan not quite or not reduces because disturbing factor causes examination to increase the weight of after vibration reduction, at this moment power frequency vibration amplitude and phase calculation influence coefficient after will increasing the weight of according to examination, increase the weight of again, adopting existing photoelectric sensor to survey phase method redefines: shut down, add counterweight firm welding, again start, measures power frequency amplitude and the phase place of residual vibration, if vibration allowed band balance finish; Otherwise start, records and add test mass after vibration value, comprises power frequency amplitude and phasing degree, utilize dynamic balance principle to calculate and should add counterweight size and to add the angle of counterweight, then re-start and increase the weight of.
Beneficial effect of the present invention:
1. support is arranged on the concrete pedestal of back-grouting, and rigidity is high, and each probe measurement of being convenient to so mounted thereto is accurate;
2. the trench structure on support is convenient to change the installation site that axle shakes and pops one's head in, and two axles shake probe in trench structure, can vertical mode of a level arrange, also can arrange by left and right 45° angle, facilitates data comparison and late time data analysis under different situations;
3. phase measurement is simple, has first at every turn and shut down while having avoided doing transient equilibrium, pastes reflective tape in rotating shaft, has reduced and has done dynamically balanced startup-shutdown number of times;
4. one-step installation is applicable all the life, while having avoided doing transient equilibrium, all vibration probe will be first installed at every turn;
5. adopt amplitude that armature spindle shakes and phase place as the foundation of calculating balance position, with respect to traditional dependence bearing liner, shake for parameter, simplified calculation procedure, greatly improved computational accuracy;
6. vibration measuring is convenient, and plug and play is measured accurately, and spot dynamic balance precision is high.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation of support.
Wherein, 1. motor, 2. bearing, 3. support, the 4. axle probe that shakes, 5. key is popped one's head in mutually, 6. impeller, 7. Fan casing.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention will be further described.
In Fig. 1, Fig. 2, impeller 6 outsides are provided with Fan casing 7, and the impeller shaft of impeller 6 is connected with motor 1 by bearing 2.On impeller shaft, nested rack 3, at support 3 horizontal levels, a key are installed and pop one's head in mutually 5, and on support 3, a trench structure is opened along circumference in pop one's head in the mutually position on 5 sides of key, be slidably fitted with two and measure axle that axles the shake probe 4 that shakes in trench structure.Wherein two axles vertical direction of 4 one horizontal directions of probe of shaking is arranged, or arranges in left and right 45° angle mode.
Dynamic balance method of the present invention is:
Step 1, utilize the axle probe 4 that shakes to pop one's head in mutually and 5 directly read vibration values with key, comprise power frequency amplitude and phase angle;
Step 2, examination increase the weight of determining of position: utilize the phase angle of reading
just can directly calculate and should increase the weight of position,
In formula,
for power frequency vibration phase value,
for vibration shape drag angle, draught fan impeller is rigid rotator, now
for the data transmission drag angle of vibration transducer, on different sensor nameplates, there is mark;
By formula (1), calculate and increase the weight of after position angle θ, at key phase groove place, against the moving rotor θ of steering wheel place, should increase the weight of position.
Step 3, examination increase the weight of determining of size: can be calculated by lower formula
In formula, the examination on P-impeller adds weight, kg;
A
0the original amplitude that-vibration transducer measures, μ m;
R-increases the weight of radius, m;
The angular velocity of ω-rotor, rad/s;
G-rotor weight, kg;
G-acceleration of gravity, m/s2;
S-sensitivity coefficient, gets 100 when bearing rigidity is normal, get 200 when bearing rigidity is on the low side;
In formula (2), desired parameters all can, according to finding in blower fan instructions, can calculate the size that examination adds weight easily.Generally (80% probability), after examination increases the weight of, fan vibration can be reduced in acceptability limit, transient equilibrium end-of-job, but do not get rid of indivedual blower fans due to the interference of other factors, cause examination to add after vibration reduction and not quite or not reduce, power frequency vibration amplitude and phase calculation influence coefficient after at this moment will increasing the weight of according to examination, increase the weight of, method is surveyed the 5th step (the scape technology of passing away part) of phase method with photoelectric sensor recited above again.Can find out, the data of watt shaking that this method has been utilized axle to shake to have adopted when data substitute conventional fan transient equilibrium, have greatly improved and have once increased the weight of successful probability, and less calculation procedure, has simplified computing formula, has reduced and shut down the complex steps of pasting cursors in technique.
Claims (2)
1. a boiler of power plant crosswind machine spot dynamic balance method, it is characterized in that, the method adopts a kind of boiler of power plant crosswind machine spot dynamic balance device, comprise: blower fan impeller shaft is connected with motor by bearing, described impeller shaft place is provided with a support, a key is installed in support level position and pops one's head in mutually, on support, a trench structure is opened along circumference in pop one's head in the mutually position on side of key, is slidably fitted with two and measures the eddy current probe that axles shake in trench structure;
Described support is arranged on concrete pedestal, and two axles shake and visit vertical direction layout of first horizontal direction, or arrange in left and right 45° angle mode; Described axle shakes probe for eddy current probe;
Steps of the method are:
Step 1, utilize axle shake probe pop one's head in mutually and read vibration values with key, comprise power frequency amplitude and phase angle;
Step 2, examination increase the weight of determining of position: utilize the phase angle of reading
directly calculate and should increase the weight of position,
In formula,
for power frequency vibration phase value,
for vibration shape drag angle, draught fan impeller is rigid rotator, now
data transmission drag angle for axle shakes and pops one's head in, has mark on different sensor nameplates;
By formula (1), calculate and increase the weight of after position angle θ, at key phase groove place, against the moving rotor θ of steering wheel place, should increase the weight of position;
Step 3, examination increase the weight of determining of size: by lower formula, calculated:
In formula, the examination on P-impeller adds weight, kg;
A0-axle original amplitude that probe measurement obtains of shaking, μ m;
R-increase the weight of radius, m;
The angular velocity of ω-rotor, rad/s;
G-rotor weight, kg;
G-acceleration of gravity, m/s2;
S-sensitivity coefficient, gets 100 when bearing rigidity is normal, get 200 when bearing rigidity is on the low side;
Desired parameters is all according to finding in blower fan instructions in formula (2), thereby calculates the size that examination adds weight.
2. boiler of power plant crosswind machine spot dynamic balance method as claimed in claim 1, it is characterized in that, as blower fan not quite or not reduces because disturbing factor causes examination to increase the weight of after vibration reduction, at this moment power frequency vibration amplitude and phase calculation influence coefficient after will increasing the weight of according to examination, increase the weight of again, adopting existing photoelectric sensor to survey phase method redefines: shut down, add counterweight firm welding, again start, measure power frequency amplitude and the phase place of residual vibration, if vibration allowed band balance finish; Otherwise start, records and add test mass after vibration value, comprises power frequency amplitude and phasing degree, utilize dynamic balance principle to calculate and should add counterweight size and to add the angle of counterweight, then re-start and increase the weight of.
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Effective date of registration: 20121029 Address after: 250002 Ji'nan City Central District, Shandong, No. 2 South Road, No. 500 Applicant after: SHANDONG ELECTRIC POWER Research Institute Applicant after: State Grid Corporation of China Address before: 250002 Ji'nan City Central District, Shandong, No. 2 South Road, No. 500 Applicant before: SHANDONG ELECTRIC POWER Research Institute |
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Address after: 250003 No. 2000, Wang Yue Road, Shizhong District, Ji'nan, Shandong Patentee after: Shandong Electric Power Research Institute Patentee after: State Grid Corporation of China Address before: 250002, No. 500, South Second Ring Road, Shizhong District, Shandong, Ji'nan Patentee before: Shandong Electric Power Research Institute Patentee before: State Grid Corporation of China |
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Address after: 250003 No. 2000, Wang Yue Road, Shizhong District, Ji'nan, Shandong Patentee after: SHANDONG ELECTRIC POWER Research Institute Patentee after: STATE GRID CORPORATION OF CHINA Address before: 250003 No. 2000, Wang Yue Road, Shizhong District, Ji'nan, Shandong Patentee before: SHANDONG ELECTRIC POWER Research Institute Patentee before: State Grid Corporation of China |
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Effective date of registration: 20220126 Address after: 250003 No. 2000, Wang Yue Road, Shizhong District, Ji'nan, Shandong Patentee after: ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER Co. Patentee after: STATE GRID CORPORATION OF CHINA Address before: 250003 No. 2000, Wang Yue Road, Shizhong District, Ji'nan, Shandong Patentee before: SHANDONG ELECTRIC POWER Research Institute Patentee before: STATE GRID CORPORATION OF CHINA |
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